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    <meta charset="UTF-8">
    <title>何为数据代理</title>
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<!-- 6、数据代理：通过一个对象代理对另一个对象中属性的操作（读、写）-->
<script type="text/javascript">
    let obj1 = {x: 1}
    let obj2 = {y: 2}

    Object.defineProperty(obj2, 'x', {
        get() {
            return obj1.x
        },
        set(value) {
            obj1.x = value
        }
    })

</script>
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